2D-IR Photon Echo Spectroscopy of Pure Liquid Water - Combination of Novel Nanofluidics and Diffractive Optics Deciphers Ultrafast Structural Dynamics

2006 ◽  
Author(s):  
A. Paarmann ◽  
D. Kraemer ◽  
M. L. Cowan ◽  
B. D. Bruner ◽  
R. J. D. Miller ◽  
...  
Keyword(s):  
Structural Dynamics ◽  
Liquid Water ◽  
Photon Echo ◽  
Diffractive Optics ◽  
Pure Liquid ◽  
2D Ir

scholarly journals Vibrational dynamics and solvatochromism of the label SCN in various solvents and hemoglobin by time dependent IR and 2D-IR spectroscopy

2014 ◽  
Vol 16 (36) ◽  
pp. 19643-19653 ◽  
Author(s):  
Luuk J. G. W. van Wilderen ◽  
Daniela Kern-Michler ◽  
Henrike M. Müller-Werkmeister ◽  
Jens Bredenbeck
Keyword(s):  
Hydrogen Bonding ◽  
Ir Spectroscopy ◽  
Structural Dynamics ◽  
Spectral Diffusion ◽  
Time Dependent ◽  
Vibrational Dynamics ◽  
2D Ir

The vibrational label SCN is used to report on local structural dynamics in a protein revealing spectral diffusion on a picosecond scale. The SCN spectra are compared to the response of methylthiocyanate in solvents with different polarity and hydrogen-bonding capabilities.

The three types of liquid water in the surface of present Mars

2009 ◽  
Vol 9 (1) ◽  
pp. 45-49 ◽  
Author(s):  
D. Möhlmann
Keyword(s):  
Solid State ◽  
Liquid Water ◽  
Bulk Water ◽  
Pure Liquid ◽  
Interfacial Water ◽  
Biological Processes ◽  
Undercooled Liquid ◽  
Liquid Bulk ◽  
Physical Chemical

AbstractThermodynamics teaches that pure liquid bulk water cannot stably exist on the surface of Mars. However, it is shown by thermodynamic arguments that liquid water can exist, at least temporarily, in the upper surface of Mars, in form of: (a) undercooled liquid interfacial water (ULI water); (b) undercooled liquid water in cryo-brines; and (c) liquid bulk water (due to solid-state greenhouse subsurface melting) in the subsurface of ice areas, which are covered by a lid of solid ice only. The presence of these forms of liquid water on present Mars is discussed in detail and in view of the possible consequences for physical, chemical and eventual biological processes.

Structural Dynamics of Rotaxanes Studied by Infrared Photon Echo Spectroscopy

2007 ◽  
pp. 430-432
Author(s):  
Sergey Yeremenko ◽  
Olaf F. A. Larsen ◽  
Pavol Bodis ◽  
Wybren Jan Buma ◽  
Jeffrey S. Hannam ◽  
...  
Keyword(s):  
Structural Dynamics ◽  
Photon Echo ◽  
Infrared Photon

2D photon-echo spectroscopy of hydrogen-bond dynamics in liquid water

2004 ◽  
pp. 165-168
Author(s):  
M.S. Pshenichnikov ◽  
S. Yeremenko ◽  
D.A. Wiersma
Keyword(s):  
Hydrogen Bond ◽  
Liquid Water ◽  
Photon Echo ◽  
Hydrogen Bond Dynamics

Vibrational relaxation of pure liquid water

2006 ◽  
Vol 421 (4-6) ◽  
pp. 329-333 ◽  
Author(s):  
Jörg Lindner ◽  
Peter Vöhringer ◽  
Maxim S. Pshenichnikov ◽  
Dan Cringus ◽  
Douwe A. Wiersma ◽  
...  
Keyword(s):  
Liquid Water ◽  
Vibrational Relaxation ◽  
Pure Liquid

A mid-infrared photon echo study of liquid water

2002 ◽  
Author(s):  
J. Stenger ◽  
D. Madsen ◽  
P. Hamm ◽  
E. T. J. Nibbering ◽  
T. Elsaesser
Keyword(s):  
Liquid Water ◽  
Photon Echo ◽  
Mid Infrared ◽  
Infrared Photon

scholarly journals The effect on structural and solvent water molecules of substrate binding to ferric horseradish peroxidase

2015 ◽  
Vol 177 ◽  
pp. 163-179 ◽  
Author(s):  
Niall Simpson ◽  
Katrin Adamczyk ◽  
Gordon Hithell ◽  
Daniel J. Shaw ◽  
Gregory M. Greetham ◽  
...  
Keyword(s):  
Horseradish Peroxidase ◽  
Structural Dynamics ◽  
Solvent Accessibility ◽  
Substrate Binding ◽  
Dynamic Environment ◽  
Water Molecules ◽  
Pump Probe ◽  
Benzohydroxamic Acid ◽  
Enzymatic Mechanism ◽  
2D Ir

Ultrafast, multi-dimensional infrared spectroscopy, in the form of 2D-IR and pump–probe measurements, has been employed to investigate the effect of substrate binding on the structural dynamics of the horseradish peroxidase (HRP) enzyme. Using nitric oxide bound to the ferric haem of HRP as a sensitive probe of local dynamics, we report measurements of the frequency fluctuations (spectral diffusion) and vibrational lifetime of the NO stretching mode with benzohydroxamic acid (BHA) located in the substrate-binding position at the periphery of the haem pocket, in both D2O and H2O solvents. The results reveal that, with BHA bound to the enzyme, the local structural dynamics are insensitive to H/D exchange. These results are in stark contrast to those found in studies of the substrate-free enzyme, which demonstrated that the local chemical and dynamic environment of the haem ligand is influenced by water molecules. In light of the large changes in solvent accessibility caused by substrate binding, we discuss the potential for varying roles for the solvent in the haem pocket of HRP at different stages along the reaction coordinate of the enzymatic mechanism.

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